package com.bwie.filter;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.annotation.Order;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

/**
 * @Author:Max
 * @Date: 2024/8/9 19:00
 * @Description
 **/
@Configuration
@Order(-1)
public class GlogFileter implements GlobalFilter {

    @Autowired
    StringRedisTemplate stringRedisTemplate;
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        String url = request.getURI().getPath();

        /**
         * 白名单
         */
        if(url.contains("/login")){
            System.out.println("白名单"+url);
            return chain.filter(exchange);
        }

        /**
         * 获取请求头
         */
        String token = request.getHeaders().getFirst("token");
        if(token==null){
            System.out.println("token为空"+url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        Claims body = Jwts.parser().setSigningKey("123456").parseClaimsJws(token).getBody();
        Integer userId = body.get("userId", Integer.class);

        String redisToken = stringRedisTemplate.opsForValue().get("token:" + userId);

        if(redisToken==null){
            System.out.println("token已过期"+url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        if(!redisToken.equals(token)){
            System.out.println("token错误"+url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        System.out.println("放行");

        return chain.filter(exchange);
    }
}
